(w+10)(w-12)=

What is the level of loudness of a sound of intensity 10^(-12) W//m^2 ?

What is the level of loudness of a sound of intensity 10^(-12) W//m^2 ?

In expressing sound intensity we take 10^(-12)(W)/(m^2) as the reference level. For ordinary conversation the intensity level is about 10^-6(W)/(m^2) . Expressed in decibel, this is

In expressing sound intensity we take 10^(-12)(W)/(m^2) as the reference level. For ordinary conversation the intensity level is about 10^-6(W)/(m^2) . Expressed in decibel, this is

The complex numbers z and w satisfy the system z+(20i)/(w)= 5+i, w+(12i)/(z)= -4+10i. The smallest possible value of |zw|^2 is

If omega is a complex cube root of unity, then value of expression cos[{(1-omega)(1-omega^2) +...+(10-omega) (10-omega^2)}pi/900]

If w is complex cube root of unity,then cos[{(1-w)(1-w^(2))+......+(10-w)(10-w^(2))}(pi)/(100)]

If w is a complex cube root of unity then the value of cos[{(1-w)(1-w^(2))(2-w)(2-w^(2))+......+(10-w)(10-w^(2))}(pi)/(9)] is

if 1,omega, omega^2 are the cube roots of unity then the value of (2-omega)(2-omega^2)(2-omega^(10))(2-omega^(11))=

If,omega,omega'2be the imaginary cube roots of unity,then prove that (2-omega)(2-omega^(2))(2-omega^(10))(2-omega^(11))=49